This is exactly the point. Your diagram shows very clearly, beyond the acromion, the NSM jacket no longer hugs the natural shoulder. It lifts off. That is not a necessary feature of a natural, unpadded shoulder. The Rubinacci jackets you see above extend along the shoulder further than most NSM jackets, yet they drop with the shoulder beyond the acromion. So, what perplexes is the argument that the NSM shoulder line is the result of being unpadded. More wadding/padding is not going to make a shoulder drop more--exactly the opposite.
Cloth does not defy gravity. It is not going to lift off the shoulder unless the tailor does something to make it happen that way. Has NSM been telling people their shoulder line is the intrinsic result of being unpadded/natural? Hope not.